Heidelberg Catechism · Lord's Day 8
25. Since there is only one God, why do you speak of three persons, Father, Son, and Holy Spirit?
Answer
Because God has so revealed himself in his Word that these three distinct persons are the one, true, eternal God.
Scripture references
Deuteronomy 6:4 · Isaiah 44:6 · Isaiah 45:5 · 1 Corinthians 8:4 · Matthew 3:16-17 · Matthew 28:19 · 1 John 5:7
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